Reactor Raises $59M in Funding Led by Lightspeed Venture Partners

The round also saw participation from WndrCo, Amplify Partners, Sky9 Capital, FPV Ventures, and additional investors.

The company plans to use the funds to expand operations and continue developing its products and technology.

Reactor is building infrastructure that allows developers to use real-time world models for interactive AI applications in media, entertainment, robotics, and physical AI.

World models represent a major shift in AI, moving from simple prompt-based tools to interactive experiences that users can explore in real time. This creates a new type of media where content is generated dynamically and changes based on user interaction instead of being pre-rendered.

Despite rapid progress in world models from major AI labs, there is still no platform that allows developers to run these models in production or build large-scale applications on top of them. Reactor is working to solve that problem.

The Reactor platform offers a unified SDK and API that lets developers create real-time interactive AI applications with only a few lines of code, without having to manage the complexity of deploying and scaling the systems themselves.

Reactor is already working with partners in media, entertainment, and physical AI, with growing demand from film and television studios as well as robotics companies.

Leading world model developers are starting to use Reactor as infrastructure for real-time AI systems. Overworld is using the platform to develop interactive world models, showing how these technologies can move from research projects into fully interactive user experiences.

"Reactor's real-time video platform demands inference infrastructure that can deliver at the speed of interaction, not just the speed of generation, and AWS is unmatched in solving for the latency, scale, and reliability that these workloads require," said Jason Bennett, VP and Global Head of Startups and Venture Capital at AWS. "Profitable AI starts with lower-cost inference. From purpose-built chips to flexible AI services, AWS is uniquely positioned to help platforms like Reactor scale real-time generative video economically to developers everywhere."

"Building world models is only part of the challenge; making them usable and responsive in real time is equally critical," said Louis Castricato, CEO at Overworld. "Reactor provides infrastructure support that helps us bring these systems to developers and users, as we work toward building a new medium of interactive entertainment you can truly inhabit."

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"Every major shift in media has been driven by new tools that expand what creators can do," said Jeffrey Katzenberg, Founding Partner at WndrCo, who will join Reactor as a board observer. "AI is a transformative moment, but the real opportunity lies in making these technologies usable at scale. Reactor is building the platform that can enable a new generation of storytelling, and interactive experiences."

"Real-time video models are currently inaccessible to developers due to a lack of infrastructure that can reliably serve them," said Bucky Moore, Partner at Lightspeed. "Alberto, Bryce, and the team bring a rare combination of real-time systems expertise and product vision to this problem, and we believe Reactor is well positioned to become the foundational platform in this new category."

"World models are redefining what AI can do, moving from systems that generate content in isolation, to ones that perceive and respond in real time," said Alberto Taiuti, co-founder and CEO of Reactor. "We are building the critical layer between the model labs and the developers who want to create with them. This is about enabling a new form of media; one where experiences that weren't previously possible, are generated live, and anyone can build and distribute them."

About Reactor

Founded by Alberto Taiuti and Bryce Schmidtchen, and headquartered in San Francisco, Reactor is a developer platform for real-time generative video. Its mission is to make real-time world models accessible to developers everywhere by providing the first full developer stack for systems that don’t just generate content, but perceive and respond to the world in real time. This enables a new type of interactive media that can be built and distributed across industries like media, entertainment, robotics, and physical AI.

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